From 69f945650ca5aafcb2a434734359dcb515a44b39 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Mon, 8 May 2017 14:48:13 +0200
Subject: [PATCH 1/8] Add rollback function support

---
 lib/plugins/Plugins.json                      |   1 +
 lib/plugins/aws/deployList/index.js           |  78 +++++-
 lib/plugins/aws/deployList/index.test.js      | 187 ++++++++++++--
 lib/plugins/aws/rollbackFunction/index.js     | 123 +++++++++
 .../aws/rollbackFunction/index.test.js        | 244 ++++++++++++++++++
 lib/plugins/deploy/deploy.js                  |   8 +
 lib/plugins/rollback/index.js                 |  23 ++
 lib/plugins/rollback/index.test.js            |  44 +++-
 package.json                                  |   2 +-
 9 files changed, 672 insertions(+), 38 deletions(-)
 create mode 100644 lib/plugins/aws/rollbackFunction/index.js
 create mode 100644 lib/plugins/aws/rollbackFunction/index.test.js

diff --git a/lib/plugins/Plugins.json b/lib/plugins/Plugins.json
index 3fb829212..af4fee885 100644
--- a/lib/plugins/Plugins.json
+++ b/lib/plugins/Plugins.json
@@ -23,6 +23,7 @@
     "./aws/metrics/awsMetrics.js",
     "./aws/remove/index.js",
     "./aws/rollback/index.js",
+    "./aws/rollbackFunction/index.js",
     "./aws/package/compile/functions/index.js",
     "./aws/package/compile/events/schedule/index.js",
     "./aws/package/compile/events/s3/index.js",
diff --git a/lib/plugins/aws/deployList/index.js b/lib/plugins/aws/deployList/index.js
index 210744da6..2ecb925ae 100644
--- a/lib/plugins/aws/deployList/index.js
+++ b/lib/plugins/aws/deployList/index.js
@@ -19,10 +19,15 @@ class AwsDeployList {
 
     this.hooks = {
       'before:deploy:list:log': () => BbPromise.bind(this)
-          .then(this.validate),
+        .then(this.validate),
+      'before:deploy:list:functions:log': () => BbPromise.bind(this)
+        .then(this.validate),
+
       'deploy:list:log': () => BbPromise.bind(this)
         .then(this.setBucketName)
         .then(this.listDeployments),
+      'deploy:list:functions:log': () => BbPromise.bind(this)
+        .then(this.listFunctions),
     };
   }
 
@@ -61,6 +66,77 @@ class AwsDeployList {
         return BbPromise.resolve();
       });
   }
+
+  // list all functions and their versions
+  listFunctions() {
+    return BbPromise.resolve().bind(this)
+      .then(this.getFunctions)
+      .then(this.getFunctionVersions)
+      .then(this.displayFunctions);
+  }
+
+  getFunctions() {
+    const params = {
+      MaxItems: 200,
+    };
+
+    return this.provider.request('Lambda',
+      'listFunctions',
+      params,
+      this.options.stage,
+      this.options.region)
+      .then((result) => {
+        const allFuncs = result.Functions;
+
+        const serviceName = `${this.serverless.service.service}-${this.options.stage}`;
+        const regex = new RegExp(serviceName);
+        const serviceFuncs = allFuncs.filter((func) => func.FunctionName.match(regex));
+
+        return BbPromise.resolve(serviceFuncs);
+      });
+  }
+
+  getFunctionVersions(funcs) {
+    const requestPromises = [];
+
+    funcs.forEach((func) => {
+      const params = {
+        FunctionName: func.FunctionName,
+        MaxItems: 5,
+      };
+
+      const request = this.provider.request('Lambda',
+        'listVersionsByFunction',
+        params,
+        this.options.stage,
+        this.options.region);
+
+      requestPromises.push(request);
+    });
+
+    return BbPromise.all(requestPromises);
+  }
+
+  displayFunctions(funcs) {
+    this.serverless.cli.log('Listing functions and their versions:');
+    this.serverless.cli.log('-------------');
+
+    funcs.forEach((func) => {
+      let message = '';
+
+      let name = func.Versions[0].FunctionName;
+      name = name.replace(`${this.serverless.service.service}-`, '');
+      name = name.replace(`${this.options.stage}-`, '');
+
+      message += `${name}: `;
+      const versions = func.Versions.map((funcEntry) => funcEntry.Version);
+
+      message += versions.join(', ');
+      this.serverless.cli.log(message);
+    });
+
+    return BbPromise.resolve();
+  }
 }
 
 module.exports = AwsDeployList;
diff --git a/lib/plugins/aws/deployList/index.test.js b/lib/plugins/aws/deployList/index.test.js
index 6cab27eb3..4b80bb32c 100644
--- a/lib/plugins/aws/deployList/index.test.js
+++ b/lib/plugins/aws/deployList/index.test.js
@@ -8,7 +8,7 @@ const Serverless = require('../../../Serverless');
 
 describe('AwsDeployList', () => {
   let serverless;
-  let awsDeploy;
+  let awsDeployList;
   let s3Key;
 
   beforeEach(() => {
@@ -20,9 +20,9 @@ describe('AwsDeployList', () => {
       region: 'us-east-1',
     };
     s3Key = `serverless/${serverless.service.service}/${options.stage}`;
-    awsDeploy = new AwsDeployList(serverless, options);
-    awsDeploy.bucketName = 'deployment-bucket';
-    awsDeploy.serverless.cli = {
+    awsDeployList = new AwsDeployList(serverless, options);
+    awsDeployList.bucketName = 'deployment-bucket';
+    awsDeployList.serverless.cli = {
       log: sinon.spy(),
     };
   });
@@ -33,29 +33,29 @@ describe('AwsDeployList', () => {
         Contents: [],
       };
       const listObjectsStub = sinon
-        .stub(awsDeploy.provider, 'request').resolves(s3Response);
+        .stub(awsDeployList.provider, 'request').resolves(s3Response);
 
-      return awsDeploy.listDeployments().then(() => {
+      return awsDeployList.listDeployments().then(() => {
         expect(listObjectsStub.calledOnce).to.be.equal(true);
         expect(listObjectsStub.calledWithExactly(
           'S3',
           'listObjectsV2',
           {
-            Bucket: awsDeploy.bucketName,
+            Bucket: awsDeployList.bucketName,
             Prefix: `${s3Key}`,
           },
-          awsDeploy.options.stage,
-          awsDeploy.options.region
+          awsDeployList.options.stage,
+          awsDeployList.options.region
         )).to.be.equal(true);
         const infoText = 'Couldn\'t find any existing deployments.';
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(infoText)).to.be.equal(true);
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(infoText)).to.be.equal(true);
         const verifyText = 'Please verify that stage and region are correct.';
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(verifyText)).to.be.equal(true);
-        awsDeploy.provider.request.restore();
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(verifyText)).to.be.equal(true);
+        awsDeployList.provider.request.restore();
       });
     });
 
-    it('should all available deployments', () => {
+    it('should display all available deployments', () => {
       const s3Response = {
         Contents: [
           { Key: `${s3Key}/113304333331-2016-08-18T13:40:06/artifact.zip` },
@@ -66,31 +66,170 @@ describe('AwsDeployList', () => {
       };
 
       const listObjectsStub = sinon
-        .stub(awsDeploy.provider, 'request').resolves(s3Response);
+        .stub(awsDeployList.provider, 'request').resolves(s3Response);
 
-      return awsDeploy.listDeployments().then(() => {
+      return awsDeployList.listDeployments().then(() => {
         expect(listObjectsStub.calledOnce).to.be.equal(true);
         expect(listObjectsStub.calledWithExactly(
           'S3',
           'listObjectsV2',
           {
-            Bucket: awsDeploy.bucketName,
+            Bucket: awsDeployList.bucketName,
             Prefix: `${s3Key}`,
           },
-          awsDeploy.options.stage,
-          awsDeploy.options.region
+          awsDeployList.options.stage,
+          awsDeployList.options.region
         )).to.be.equal(true);
         const infoText = 'Listing deployments:';
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(infoText)).to.be.equal(true);
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(infoText)).to.be.equal(true);
         const timestampOne = 'Timestamp: 113304333331';
         const datetimeOne = 'Datetime: 2016-08-18T13:40:06';
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(timestampOne)).to.be.equal(true);
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(datetimeOne)).to.be.equal(true);
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(timestampOne)).to.be.equal(true);
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(datetimeOne)).to.be.equal(true);
         const timestampTow = 'Timestamp: 903940390431';
         const datetimeTwo = 'Datetime: 2016-08-18T23:42:08';
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(timestampTow)).to.be.equal(true);
-        expect(awsDeploy.serverless.cli.log.calledWithExactly(datetimeTwo)).to.be.equal(true);
-        awsDeploy.provider.request.restore();
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(timestampTow)).to.be.equal(true);
+        expect(awsDeployList.serverless.cli.log.calledWithExactly(datetimeTwo)).to.be.equal(true);
+        awsDeployList.provider.request.restore();
+      });
+    });
+  });
+
+  describe('#listFunctions()', () => {
+    let getFunctionsStub;
+    let getFunctionVersionsStub;
+    let displayFunctionsStub;
+
+    beforeEach(() => {
+      getFunctionsStub = sinon.stub(awsDeployList, 'getFunctions').resolves();
+      getFunctionVersionsStub = sinon.stub(awsDeployList, 'getFunctionVersions').resolves();
+      displayFunctionsStub = sinon.stub(awsDeployList, 'displayFunctions').resolves();
+    });
+
+    afterEach(() => {
+      awsDeployList.getFunctions.restore();
+      awsDeployList.getFunctionVersions.restore();
+      awsDeployList.displayFunctions.restore();
+    });
+
+    it('should run promise chain in order', () => awsDeployList
+      .listFunctions().then(() => {
+        expect(getFunctionsStub.calledOnce).to.equal(true);
+        expect(getFunctionVersionsStub.calledAfter(getFunctionsStub)).to.equal(true);
+        expect(displayFunctionsStub.calledAfter(getFunctionVersionsStub)).to.equal(true);
+      })
+    );
+  });
+
+  describe('#getFunctions()', () => {
+    let listFunctionsStub;
+
+    beforeEach(() => {
+      listFunctionsStub = sinon
+        .stub(awsDeployList.provider, 'request')
+        .resolves({
+          Functions: [
+            { FunctionName: 'listDeployments-dev-func1' },
+            { FunctionName: 'listDeployments-dev-func2' },
+            { FunctionName: 'unrelatedService-dev-func3' },
+            { FunctionName: 'unrelatedService-dev-func4' },
+          ],
+        });
+    });
+
+    afterEach(() => {
+      awsDeployList.provider.request.restore();
+    });
+
+    it('should get all functions and filter out the service related ones', () => {
+      const expectedResult = [
+        { FunctionName: 'listDeployments-dev-func1' },
+        { FunctionName: 'listDeployments-dev-func2' },
+      ];
+
+      return awsDeployList.getFunctions().then((result) => {
+        expect(listFunctionsStub.calledOnce).to.equal(true);
+        expect(listFunctionsStub.calledWithExactly(
+          'Lambda',
+          'listFunctions',
+          {
+            MaxItems: 200,
+          },
+          awsDeployList.options.stage,
+          awsDeployList.options.region
+        )).to.equal(true);
+        expect(result).to.deep.equal(expectedResult);
+      });
+    });
+  });
+
+  describe('#getFunctionVersions()', () => {
+    let listVersionsByFunctionStub;
+
+    beforeEach(() => {
+      listVersionsByFunctionStub = sinon
+        .stub(awsDeployList.provider, 'request')
+        .resolves({
+          Versions: [
+            { FunctionName: 'listDeployments-dev-func', Version: '$LATEST' },
+          ],
+        });
+    });
+
+    afterEach(() => {
+      awsDeployList.provider.request.restore();
+    });
+
+    it('should return the versions for the provided functions', () => {
+      const funcs = [
+        { FunctionName: 'listDeployments-dev-func1' },
+        { FunctionName: 'listDeployments-dev-func2' },
+      ];
+
+      return awsDeployList.getFunctionVersions(funcs).then((result) => {
+        const expectedResult = [
+          {
+            Versions: [
+              { FunctionName: 'listDeployments-dev-func', Version: '$LATEST' },
+            ],
+          },
+          {
+            Versions: [
+              { FunctionName: 'listDeployments-dev-func', Version: '$LATEST' },
+            ],
+          },
+        ];
+
+        expect(listVersionsByFunctionStub.calledTwice).to.equal(true);
+        expect(result).to.deep.equal(expectedResult);
+      });
+    });
+  });
+
+  describe('#displayFunctions()', () => {
+    const funcs = [
+      {
+        Versions: [
+          { FunctionName: 'listDeployments-dev-func-1', Version: '$LATEST' },
+        ],
+      },
+      {
+        Versions: [
+          { FunctionName: 'listDeployments-dev-func-2', Version: '$LATEST' },
+          { FunctionName: 'listDeployments-dev-func-2', Version: '4711' },
+        ],
+      },
+    ];
+
+    it('should display all the functions in the service together with their versions', () => {
+      const log = awsDeployList.serverless.cli.log;
+
+      return awsDeployList.displayFunctions(funcs).then(() => {
+        expect(log.calledWithExactly('Listing functions and their versions:')).to.be.equal(true);
+        expect(log.calledWithExactly('-------------')).to.be.equal(true);
+
+        expect(log.calledWithExactly('func-1: $LATEST')).to.be.equal(true);
+        expect(log.calledWithExactly('func-2: $LATEST, 4711')).to.be.equal(true);
       });
     });
   });
diff --git a/lib/plugins/aws/rollbackFunction/index.js b/lib/plugins/aws/rollbackFunction/index.js
new file mode 100644
index 000000000..49cc1d19d
--- /dev/null
+++ b/lib/plugins/aws/rollbackFunction/index.js
@@ -0,0 +1,123 @@
+'use strict';
+
+const BbPromise = require('bluebird');
+const validate = require('../lib/validate');
+const fetch = require('node-fetch');
+
+class AwsRollbackFunction {
+  constructor(serverless, options) {
+    this.serverless = serverless;
+    this.options = options || {};
+    this.provider = this.serverless.getProvider('aws');
+
+    Object.assign(this, validate);
+
+    this.commands = {
+      rollback: {
+        commands: {
+          function: {
+            usage: 'Rollback the function to a specific version',
+            lifecycleEvents: [
+              'rollback',
+            ],
+            options: {
+              function: {
+                usage: 'Name of the function',
+                shortcut: 'f',
+                required: true,
+              },
+              version: {
+                usage: 'Version of the function',
+                shortcut: 'v',
+                required: true,
+              },
+              stage: {
+                usage: 'Stage of the function',
+                shortcut: 's',
+              },
+              region: {
+                usage: 'Region of the function',
+                shortcut: 'r',
+              },
+            },
+          },
+        },
+      },
+    };
+
+    this.hooks = {
+      'rollback:function:rollback': () => BbPromise.bind(this)
+        .then(this.validate)
+        .then(this.getFunctionToBeRestored)
+        .then(this.fetchFunctionCode)
+        .then(this.restoreFunction),
+    };
+  }
+
+  getFunctionToBeRestored() {
+    const funcName = this.options.function;
+    let funcVersion = this.options.version;
+
+    // versions need to be string so that AWS understands it
+    funcVersion = String(this.options.version);
+
+    this.serverless.cli.log(`Rolling back function "${funcName}" to version "${funcVersion}"...`);
+
+    const funcObj = this.serverless.service.getFunction(funcName);
+
+    const params = {
+      FunctionName: funcObj.name,
+      Qualifier: funcVersion,
+    };
+
+    return this.provider.request(
+      'Lambda',
+      'getFunction',
+      params,
+      this.options.stage, this.options.region
+    )
+    .then((func) => func)
+    .catch((error) => {
+      if (error.message.match(/not found/)) {
+        const errorMessage = [
+          `Function "${funcName}" with version "${funcVersion}" not found.`,
+          ` Please check if you've deployed "${funcName}"`,
+          ` and version "${funcVersion}" is available for this function.`,
+          ' Please check the docs for more info.',
+        ].join('');
+        throw new Error(errorMessage);
+      }
+      throw new Error(error.message);
+    });
+  }
+
+  fetchFunctionCode(func) {
+    const codeUrl = func.Code.Location;
+
+    return fetch(codeUrl).then((response) => response.buffer());
+  }
+
+  restoreFunction(zipBuffer) {
+    const funcName = this.options.function;
+
+    this.serverless.cli.log('Restoring function...');
+
+    const funcObj = this.serverless.service.getFunction(funcName);
+
+    const params = {
+      FunctionName: funcObj.name,
+      ZipFile: zipBuffer,
+    };
+
+    return this.provider.request(
+      'Lambda',
+      'updateFunctionCode',
+      params,
+      this.options.stage, this.options.region
+    ).then(() => {
+      this.serverless.cli.log(`Successfully rolled back function: "${this.options.function}"`);
+    });
+  }
+}
+
+module.exports = AwsRollbackFunction;
diff --git a/lib/plugins/aws/rollbackFunction/index.test.js b/lib/plugins/aws/rollbackFunction/index.test.js
new file mode 100644
index 000000000..8822c0700
--- /dev/null
+++ b/lib/plugins/aws/rollbackFunction/index.test.js
@@ -0,0 +1,244 @@
+'use strict';
+
+const expect = require('chai').expect;
+const sinon = require('sinon');
+const Serverless = require('../../../Serverless');
+const AwsProvider = require('../provider/awsProvider');
+const CLI = require('../../../classes/CLI');
+const proxyquire = require('proxyquire');
+
+describe('AwsRollbackFunction', () => {
+  let serverless;
+  let awsRollbackFunction;
+  let consoleLogStub;
+  let fetchStub;
+  let AwsRollbackFunction;
+
+  beforeEach(() => {
+    fetchStub = sinon.stub().resolves({ buffer: () => {} });
+    AwsRollbackFunction = proxyquire('./index.js', {
+      'node-fetch': fetchStub,
+    });
+    serverless = new Serverless();
+    serverless.servicePath = true;
+    serverless.service.functions = {
+      hello: {
+        handler: true,
+        name: 'service-dev-hello',
+      },
+    };
+    const options = {
+      stage: 'dev',
+      region: 'us-east-1',
+      function: 'hello',
+    };
+    serverless.setProvider('aws', new AwsProvider(serverless));
+    serverless.cli = new CLI(serverless);
+    awsRollbackFunction = new AwsRollbackFunction(serverless, options);
+    consoleLogStub = sinon.stub(serverless.cli, 'consoleLog').returns();
+  });
+
+  afterEach(() => {
+    serverless.cli.consoleLog.restore();
+  });
+
+  describe('#constructor()', () => {
+    let validateStub;
+    let getFunctionToBeRestoredStub;
+    let fetchFunctionCodeStub;
+    let restoreFunctionStub;
+
+    beforeEach(() => {
+      validateStub = sinon
+        .stub(awsRollbackFunction, 'validate').resolves();
+      getFunctionToBeRestoredStub = sinon
+        .stub(awsRollbackFunction, 'getFunctionToBeRestored').resolves();
+      fetchFunctionCodeStub = sinon
+        .stub(awsRollbackFunction, 'fetchFunctionCode').resolves();
+      restoreFunctionStub = sinon
+        .stub(awsRollbackFunction, 'restoreFunction').resolves();
+    });
+
+    afterEach(() => {
+      awsRollbackFunction.validate.restore();
+      awsRollbackFunction.getFunctionToBeRestored.restore();
+      awsRollbackFunction.fetchFunctionCode.restore();
+      awsRollbackFunction.restoreFunction.restore();
+    });
+
+    it('should have hooks', () => expect(awsRollbackFunction.hooks).to.be.not.empty);
+
+    it('should have commands', () => expect(awsRollbackFunction.commands).to.be.not.empty);
+
+    it('should set the provider variable to an instance of AwsProvider', () =>
+      expect(awsRollbackFunction.provider).to.be.instanceof(AwsProvider));
+
+    it('should set an empty options object if no options are given', () => {
+      const awsRollbackFunctionWithEmptyOptions = new AwsRollbackFunction(serverless);
+      expect(awsRollbackFunctionWithEmptyOptions.options).to.deep.equal({});
+    });
+
+    it('should run promise chain in order', () => awsRollbackFunction
+      .hooks['rollback:function:rollback']().then(() => {
+        expect(validateStub.calledOnce).to.equal(true);
+        expect(getFunctionToBeRestoredStub.calledAfter(validateStub)).to.equal(true);
+        expect(fetchFunctionCodeStub.calledAfter(getFunctionToBeRestoredStub)).to.equal(true);
+        expect(restoreFunctionStub.calledAfter(fetchFunctionCodeStub)).to.equal(true);
+      })
+    );
+  });
+
+  describe('#getFunctionToBeRestored()', () => {
+    describe('when function and version can be found', () => {
+      let getFunctionStub;
+
+      beforeEach(() => {
+        getFunctionStub = sinon
+          .stub(awsRollbackFunction.provider, 'request')
+          .resolves({ function: 'hello' });
+      });
+
+      afterEach(() => {
+        awsRollbackFunction.provider.request.restore();
+      });
+
+      it('should return the requested function', () => {
+        awsRollbackFunction.options.function = 'hello';
+        awsRollbackFunction.options.version = '4711';
+
+        return awsRollbackFunction.getFunctionToBeRestored().then((result) => {
+          expect(getFunctionStub.calledOnce).to.equal(true);
+          expect(getFunctionStub.calledWithExactly(
+            'Lambda',
+            'getFunction',
+            {
+              FunctionName: 'service-dev-hello',
+              Qualifier: '4711',
+            },
+            awsRollbackFunction.options.stage,
+            awsRollbackFunction.options.region
+          )).to.equal(true);
+          expect(consoleLogStub.called).to.equal(true);
+          expect(result).to.deep.equal({ function: 'hello' });
+        });
+      });
+    });
+
+    describe('when function or version could not be found', () => {
+      let getFunctionStub;
+
+      beforeEach(() => {
+        getFunctionStub = sinon
+          .stub(awsRollbackFunction.provider, 'request')
+          .rejects(new Error('function hello not found'));
+      });
+
+      afterEach(() => {
+        awsRollbackFunction.provider.request.restore();
+      });
+
+      it('should translate the error message to a custom error message', () => {
+        awsRollbackFunction.options.function = 'hello';
+        awsRollbackFunction.options.version = '4711';
+
+        return awsRollbackFunction.getFunctionToBeRestored().catch((error) => {
+          expect(error.message.match(/Function "hello" with version "4711" not found/));
+          expect(getFunctionStub.calledOnce).to.equal(true);
+          expect(getFunctionStub.calledWithExactly(
+            'Lambda',
+            'getFunction',
+            {
+              FunctionName: 'service-dev-hello',
+              Qualifier: '4711',
+            },
+            awsRollbackFunction.options.stage,
+            awsRollbackFunction.options.region
+          )).to.equal(true);
+          expect(consoleLogStub.called).to.equal(true);
+        });
+      });
+    });
+
+    describe('when other error occurred', () => {
+      let getFunctionStub;
+
+      beforeEach(() => {
+        getFunctionStub = sinon
+          .stub(awsRollbackFunction.provider, 'request')
+          .rejects(new Error('something went wrong'));
+      });
+
+      afterEach(() => {
+        awsRollbackFunction.provider.request.restore();
+      });
+
+      it('should re-throw the error without translating it to a custom error message', () => {
+        awsRollbackFunction.options.function = 'hello';
+        awsRollbackFunction.options.version = '4711';
+
+        return awsRollbackFunction.getFunctionToBeRestored().catch((error) => {
+          expect(error.message.match(/something went wrong/));
+          expect(getFunctionStub.calledOnce).to.equal(true);
+          expect(getFunctionStub.calledWithExactly(
+            'Lambda',
+            'getFunction',
+            {
+              FunctionName: 'service-dev-hello',
+              Qualifier: '4711',
+            },
+            awsRollbackFunction.options.stage,
+            awsRollbackFunction.options.region
+          )).to.equal(true);
+          expect(consoleLogStub.called).to.equal(true);
+        });
+      });
+    });
+  });
+
+  describe('#fetchFunctionCode()', () => {
+    it('should fetch the zip file content of the previously requested function', () => {
+      const func = {
+        Code: {
+          Location: 'https://foo.com/bar',
+        },
+      };
+
+      return awsRollbackFunction.fetchFunctionCode(func).then(() => {
+        expect(fetchStub.called).to.equal(true);
+      });
+    });
+  });
+
+  describe('#restoreFunction()', () => {
+    let updateFunctionCodeStub;
+
+    beforeEach(() => {
+      updateFunctionCodeStub = sinon
+        .stub(awsRollbackFunction.provider, 'request').resolves();
+    });
+
+    afterEach(() => {
+      awsRollbackFunction.provider.request.restore();
+    });
+
+    it('should restore the provided function', () => {
+      awsRollbackFunction.options.function = 'hello';
+      const zipBuffer = new Buffer('');
+
+      return awsRollbackFunction.restoreFunction(zipBuffer).then(() => {
+        expect(updateFunctionCodeStub.calledOnce).to.equal(true);
+        expect(updateFunctionCodeStub.calledWithExactly(
+          'Lambda',
+          'updateFunctionCode',
+          {
+            FunctionName: 'service-dev-hello',
+            ZipFile: zipBuffer,
+          },
+          awsRollbackFunction.options.stage,
+          awsRollbackFunction.options.region
+        )).to.equal(true);
+        expect(consoleLogStub.called).to.equal(true);
+      });
+    });
+  });
+});
diff --git a/lib/plugins/deploy/deploy.js b/lib/plugins/deploy/deploy.js
index 1313a010a..dde9ce0de 100644
--- a/lib/plugins/deploy/deploy.js
+++ b/lib/plugins/deploy/deploy.js
@@ -67,6 +67,14 @@ class Deploy {
             lifecycleEvents: [
               'log',
             ],
+            commands: {
+              functions: {
+                usage: 'List all the deployed functions and their versions',
+                lifecycleEvents: [
+                  'log',
+                ],
+              },
+            },
           },
         },
       },
diff --git a/lib/plugins/rollback/index.js b/lib/plugins/rollback/index.js
index d388d331c..0170f9c7d 100644
--- a/lib/plugins/rollback/index.js
+++ b/lib/plugins/rollback/index.js
@@ -22,6 +22,29 @@ class Rollback {
             shortcut: 'v',
           },
         },
+        commands: {
+          function: {
+            usage: 'Rollback the function to the previous version',
+            lifecycleEvents: [
+              'rollback',
+            ],
+            options: {
+              function: {
+                usage: 'Name of the function',
+                shortcut: 'f',
+                required: true,
+              },
+              stage: {
+                usage: 'Stage of the function',
+                shortcut: 's',
+              },
+              region: {
+                usage: 'Region of the function',
+                shortcut: 'r',
+              },
+            },
+          },
+        },
       },
     };
   }
diff --git a/lib/plugins/rollback/index.test.js b/lib/plugins/rollback/index.test.js
index d04bd8e20..1ff84bb47 100644
--- a/lib/plugins/rollback/index.test.js
+++ b/lib/plugins/rollback/index.test.js
@@ -14,21 +14,41 @@ describe('Rollback', () => {
   });
 
   describe('#constructor()', () => {
-    it('should have the command rollback', () => {
-      // eslint-disable-next-line no-unused-expressions
-      expect(rollback.commands.rollback).to.not.be.undefined;
+    describe('when dealing with normal rollbacks', () => {
+      it('should have the command "rollback"', () => {
+        // eslint-disable-next-line no-unused-expressions
+        expect(rollback.commands.rollback).to.not.be.undefined;
+      });
+
+      it('should have a lifecycle events initialize and rollback', () => {
+        expect(rollback.commands.rollback.lifecycleEvents).to.deep.equal([
+          'initialize',
+          'rollback',
+        ]);
+      });
+
+      it('should have a required option timestamp', () => {
+        // eslint-disable-next-line no-unused-expressions
+        expect(rollback.commands.rollback.options.timestamp.required).to.be.true;
+      });
     });
 
-    it('should have a lifecycle events initialize and rollback', () => {
-      expect(rollback.commands.rollback.lifecycleEvents).to.deep.equal([
-        'initialize',
-        'rollback',
-      ]);
-    });
+    describe('when dealing with function rollbacks', () => {
+      it('should have the command "rollback function"', () => {
+        // eslint-disable-next-line no-unused-expressions
+        expect(rollback.commands.rollback.commands.function).to.not.be.undefined;
+      });
 
-    it('should have a required option timestamp', () => {
-      // eslint-disable-next-line no-unused-expressions
-      expect(rollback.commands.rollback.options.timestamp.required).to.be.true;
+      it('should have a lifecycle event rollback', () => {
+        expect(rollback.commands.rollback.commands.function.lifecycleEvents).to.deep.equal([
+          'rollback',
+        ]);
+      });
+
+      it('should have a required option function', () => {
+        // eslint-disable-next-line no-unused-expressions
+        expect(rollback.commands.rollback.commands.function.options.function.required).to.be.true;
+      });
     });
   });
 });
diff --git a/package.json b/package.json
index e22f1e5c4..a70ba8ead 100644
--- a/package.json
+++ b/package.json
@@ -99,7 +99,7 @@
     "lodash": "^4.13.1",
     "minimist": "^1.2.0",
     "moment": "^2.13.0",
-    "node-fetch": "^1.5.3",
+    "node-fetch": "^1.6.0",
     "replaceall": "^0.1.6",
     "resolve-from": "^2.0.0",
     "semver": "^5.0.3",

From 581720217e5e993dcafb2b88588f9698a1d2ed09 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Thu, 11 May 2017 15:12:15 +0200
Subject: [PATCH 2/8] Add docs

---
 docs/providers/aws/README.md                  |  1 +
 .../aws/cli-reference/deploy-list.md          | 18 ++++++----
 .../aws/cli-reference/rollback-function.md    | 34 +++++++++++++++++++
 3 files changed, 47 insertions(+), 6 deletions(-)
 create mode 100644 docs/providers/aws/cli-reference/rollback-function.md

diff --git a/docs/providers/aws/README.md b/docs/providers/aws/README.md
index 0c3f5efae..f25b4437e 100644
--- a/docs/providers/aws/README.md
+++ b/docs/providers/aws/README.md
@@ -65,6 +65,7 @@ If you have questions, join the [chat in gitter](https://gitter.im/serverless/se
         <li><a href="./cli-reference/metrics.md">Metrics</a></li>
         <li><a href="./cli-reference/info.md">Info</a></li>
         <li><a href="./cli-reference/rollback.md">Rollback</a></li>
+        <li><a href="./cli-reference/rollback-function.md">Rollback Function</a></li>
         <li><a href="./cli-reference/remove.md">Remove</a></li>
         <li><a href="./cli-reference/slstats.md">Serverless Stats</a></li>
       </ul>
diff --git a/docs/providers/aws/cli-reference/deploy-list.md b/docs/providers/aws/cli-reference/deploy-list.md
index e182d729f..2c61737aa 100644
--- a/docs/providers/aws/cli-reference/deploy-list.md
+++ b/docs/providers/aws/cli-reference/deploy-list.md
@@ -12,21 +12,27 @@ layout: Doc
 
 # AWS - Deploy List
 
-The `sls deploy list` command will list your recent deployments available in your S3 deployment bucket. It will use stage and region from the provider config and show the timestamp of each deployment so you can roll back if necessary using `sls rollback`.
+The `sls deploy list [functions]` command will list information about your deployments.
+
+You can either see all available deployments in your S3 deployment bucket by running `serverless deploy list` or you can see the deployed functions by running `serverless deploy list functions`.
+
+The displayed information is useful when rolling back a deployment or function via `serverless rollback`.
 
 ## Options
 
 - `--stage` or `-s` The stage in your service that you want to deploy to.
 - `--region` or `-r` The region in that stage that you want to deploy to.
 
-## Artifacts
-
-After the `serverless deploy` command runs all created deployment artifacts are placed in the `.serverless` folder of the service.
-
 ## Examples
 
 ### List existing deploys
 
 ```bash
-serverless deploy list --stage dev --region us-east-1
+serverless deploy list
+```
+
+### List deployed functions and their versions
+
+```bash
+serverless deploy list functions
 ```
diff --git a/docs/providers/aws/cli-reference/rollback-function.md b/docs/providers/aws/cli-reference/rollback-function.md
new file mode 100644
index 000000000..8d498a9fb
--- /dev/null
+++ b/docs/providers/aws/cli-reference/rollback-function.md
@@ -0,0 +1,34 @@
+<!--
+title: Serverless Rollback Function CLI Command
+menuText: rollback function
+menuOrder: 16
+description: Rollback a function to a specific version
+layout: Doc
+-->
+
+<!-- DOCS-SITE-LINK:START automatically generated  -->
+### [Read this on the main serverless docs site](https://www.serverless.com/framework/docs/providers/aws/cli-reference/rollback-function)
+<!-- DOCS-SITE-LINK:END -->
+
+
+# AWS - Rollback Function
+
+Rollback a function service to a specific version.
+
+```bash
+serverless rollback function --name <name> --version <version>
+```
+
+## Options
+
+- `--name` or `-n` The name of the function which should be rolled-back
+- `--version` or `-v` The version to which the function should be rolled back
+
+## Examples
+
+### AWS
+
+At first you want to run `serverless deploy list functions` to see all the deployed functions of your service and their corresponding versions.
+After picking a function and the version you can run the `serverless rollback function` command to rollback the function.
+
+E.g. `serverless rollback function -f my-function -v 23` rolls back the function `my-function` to the version `23`.

From bea2c1782441b8f00e45d2e0a9c2ab1556a3e251 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Thu, 11 May 2017 15:15:15 +0200
Subject: [PATCH 3/8] Fix typo

---
 lib/plugins/aws/rollbackFunction/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/plugins/aws/rollbackFunction/index.js b/lib/plugins/aws/rollbackFunction/index.js
index 49cc1d19d..ec40a39b6 100644
--- a/lib/plugins/aws/rollbackFunction/index.js
+++ b/lib/plugins/aws/rollbackFunction/index.js
@@ -115,7 +115,7 @@ class AwsRollbackFunction {
       params,
       this.options.stage, this.options.region
     ).then(() => {
-      this.serverless.cli.log(`Successfully rolled back function: "${this.options.function}"`);
+      this.serverless.cli.log(`Successfully rolled back function "${this.options.function}"`);
     });
   }
 }

From 8d2624605bfe7bf7bd3f5145a6f02cb72f2ef9a1 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Thu, 11 May 2017 15:19:52 +0200
Subject: [PATCH 4/8] Re-order function versions when displaying

---
 lib/plugins/aws/deployList/index.js      | 2 +-
 lib/plugins/aws/deployList/index.test.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/plugins/aws/deployList/index.js b/lib/plugins/aws/deployList/index.js
index 2ecb925ae..78803ea04 100644
--- a/lib/plugins/aws/deployList/index.js
+++ b/lib/plugins/aws/deployList/index.js
@@ -129,7 +129,7 @@ class AwsDeployList {
       name = name.replace(`${this.options.stage}-`, '');
 
       message += `${name}: `;
-      const versions = func.Versions.map((funcEntry) => funcEntry.Version);
+      const versions = func.Versions.map((funcEntry) => funcEntry.Version).reverse();
 
       message += versions.join(', ');
       this.serverless.cli.log(message);
diff --git a/lib/plugins/aws/deployList/index.test.js b/lib/plugins/aws/deployList/index.test.js
index 4b80bb32c..6799374d3 100644
--- a/lib/plugins/aws/deployList/index.test.js
+++ b/lib/plugins/aws/deployList/index.test.js
@@ -229,7 +229,7 @@ describe('AwsDeployList', () => {
         expect(log.calledWithExactly('-------------')).to.be.equal(true);
 
         expect(log.calledWithExactly('func-1: $LATEST')).to.be.equal(true);
-        expect(log.calledWithExactly('func-2: $LATEST, 4711')).to.be.equal(true);
+        expect(log.calledWithExactly('func-2: 4711, $LATEST')).to.be.equal(true);
       });
     });
   });

From 491d754b2b611f4057f987a8e725928532ea6720 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Thu, 11 May 2017 18:00:34 +0200
Subject: [PATCH 5/8] Add note that only the last 5 versions are shown

---
 lib/plugins/aws/deployList/index.js      | 2 +-
 lib/plugins/aws/deployList/index.test.js | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/plugins/aws/deployList/index.js b/lib/plugins/aws/deployList/index.js
index 78803ea04..4a13d3f75 100644
--- a/lib/plugins/aws/deployList/index.js
+++ b/lib/plugins/aws/deployList/index.js
@@ -118,7 +118,7 @@ class AwsDeployList {
   }
 
   displayFunctions(funcs) {
-    this.serverless.cli.log('Listing functions and their versions:');
+    this.serverless.cli.log('Listing functions and their last 5 versions:');
     this.serverless.cli.log('-------------');
 
     funcs.forEach((func) => {
diff --git a/lib/plugins/aws/deployList/index.test.js b/lib/plugins/aws/deployList/index.test.js
index 6799374d3..f2de54a8c 100644
--- a/lib/plugins/aws/deployList/index.test.js
+++ b/lib/plugins/aws/deployList/index.test.js
@@ -225,7 +225,8 @@ describe('AwsDeployList', () => {
       const log = awsDeployList.serverless.cli.log;
 
       return awsDeployList.displayFunctions(funcs).then(() => {
-        expect(log.calledWithExactly('Listing functions and their versions:')).to.be.equal(true);
+        expect(log.calledWithExactly('Listing functions and their last 5 versions:'))
+          .to.be.equal(true);
         expect(log.calledWithExactly('-------------')).to.be.equal(true);
 
         expect(log.calledWithExactly('func-1: $LATEST')).to.be.equal(true);

From fc9a7a1e5c101e6709c867ca42dc817f18b5c092 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Thu, 11 May 2017 18:12:13 +0200
Subject: [PATCH 6/8] Shrinkwrapping

---
 npm-shrinkwrap.json | 3413 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 3231 insertions(+), 182 deletions(-)

diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index b3bce9b0f..335816aac 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -2,6 +2,52 @@
   "name": "serverless",
   "version": "1.13.2",
   "dependencies": {
+    "abab": {
+      "version": "1.0.3",
+      "from": "abab@>=1.0.3 <2.0.0",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-1.0.3.tgz",
+      "dev": true
+    },
+    "abbrev": {
+      "version": "1.0.9",
+      "from": "abbrev@>=1.0.0 <1.1.0",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "dev": true
+    },
+    "acorn": {
+      "version": "5.0.3",
+      "from": "acorn@>=5.0.1 <6.0.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.0.3.tgz",
+      "dev": true
+    },
+    "acorn-globals": {
+      "version": "3.1.0",
+      "from": "acorn-globals@>=3.1.0 <4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-3.1.0.tgz",
+      "dev": true,
+      "dependencies": {
+        "acorn": {
+          "version": "4.0.11",
+          "from": "acorn@>=4.0.4 <5.0.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.11.tgz",
+          "dev": true
+        }
+      }
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "from": "acorn-jsx@>=3.0.0 <4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "dev": true,
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "from": "acorn@>=3.0.4 <4.0.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "dev": true
+        }
+      }
+    },
     "agent-base": {
       "version": "2.0.1",
       "from": "agent-base@>=2.0.0 <3.0.0",
@@ -14,25 +60,79 @@
         }
       }
     },
+    "ajv": {
+      "version": "4.11.8",
+      "from": "ajv@>=4.7.0 <5.0.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+      "dev": true
+    },
+    "ajv-keywords": {
+      "version": "1.5.1",
+      "from": "ajv-keywords@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
+      "dev": true
+    },
+    "align-text": {
+      "version": "0.1.4",
+      "from": "align-text@>=0.1.3 <0.2.0",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "dev": true
+    },
+    "amdefine": {
+      "version": "1.0.1",
+      "from": "amdefine@>=0.0.4",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "dev": true
+    },
+    "ansi-escapes": {
+      "version": "1.4.0",
+      "from": "ansi-escapes@>=1.1.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
+      "dev": true
+    },
+    "ansi-red": {
+      "version": "0.1.1",
+      "from": "ansi-red@>=0.1.1 <0.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-red/-/ansi-red-0.1.1.tgz",
+      "dev": true
+    },
     "ansi-regex": {
-      "version": "2.1.1",
+      "version": "2.0.0",
       "from": "ansi-regex@>=2.0.0 <3.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz"
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz"
     },
     "ansi-styles": {
       "version": "2.2.1",
       "from": "ansi-styles@>=2.2.1 <3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz"
     },
+    "ansi-wrap": {
+      "version": "0.1.0",
+      "from": "ansi-wrap@0.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
+      "dev": true
+    },
+    "ansicolors": {
+      "version": "0.2.1",
+      "from": "ansicolors@>=0.2.1 <0.3.0",
+      "resolved": "https://registry.npmjs.org/ansicolors/-/ansicolors-0.2.1.tgz",
+      "dev": true
+    },
+    "append-transform": {
+      "version": "0.4.0",
+      "from": "append-transform@>=0.4.0 <0.5.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-0.4.0.tgz",
+      "dev": true
+    },
     "archiver": {
-      "version": "1.3.0",
+      "version": "1.2.0",
       "from": "archiver@>=1.1.0 <2.0.0",
-      "resolved": "https://registry.npmjs.org/archiver/-/archiver-1.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/archiver/-/archiver-1.2.0.tgz",
       "dependencies": {
         "async": {
-          "version": "2.4.0",
+          "version": "2.1.4",
           "from": "async@>=2.0.0 <3.0.0",
-          "resolved": "https://registry.npmjs.org/async/-/async-2.4.0.tgz"
+          "resolved": "https://registry.npmjs.org/async/-/async-2.1.4.tgz"
         }
       }
     },
@@ -46,6 +146,24 @@
       "from": "argparse@>=1.0.7 <2.0.0",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz"
     },
+    "arr-diff": {
+      "version": "2.0.0",
+      "from": "arr-diff@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
+      "dev": true
+    },
+    "arr-flatten": {
+      "version": "1.0.3",
+      "from": "arr-flatten@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.0.3.tgz",
+      "dev": true
+    },
+    "array-equal": {
+      "version": "1.0.0",
+      "from": "array-equal@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
+      "dev": true
+    },
     "array-union": {
       "version": "1.0.2",
       "from": "array-union@>=1.0.1 <2.0.0",
@@ -56,6 +174,48 @@
       "from": "array-uniq@>=1.0.1 <2.0.0",
       "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz"
     },
+    "array-unique": {
+      "version": "0.2.1",
+      "from": "array-unique@>=0.2.1 <0.3.0",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
+      "dev": true
+    },
+    "array.prototype.find": {
+      "version": "2.0.4",
+      "from": "array.prototype.find@>=2.0.1 <3.0.0",
+      "resolved": "https://registry.npmjs.org/array.prototype.find/-/array.prototype.find-2.0.4.tgz",
+      "dev": true
+    },
+    "arrify": {
+      "version": "1.0.1",
+      "from": "arrify@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "dev": true
+    },
+    "asap": {
+      "version": "2.0.5",
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 }

From 1550bfffaac76b3a8ee9737d368ba5350bb2a4e6 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Mon, 15 May 2017 10:34:32 +0200
Subject: [PATCH 7/8] Add version option to core rollback plugin

---
 lib/plugins/rollback/index.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/plugins/rollback/index.js b/lib/plugins/rollback/index.js
index 0170f9c7d..4adbcccdc 100644
--- a/lib/plugins/rollback/index.js
+++ b/lib/plugins/rollback/index.js
@@ -34,6 +34,11 @@ class Rollback {
                 shortcut: 'f',
                 required: true,
               },
+              version: {
+                usage: 'Version of the function',
+                shortcut: 'v',
+                required: true,
+              },
               stage: {
                 usage: 'Stage of the function',
                 shortcut: 's',

From 6b444e0729c469cacdbc1055b2d6aec9c17ab2f2 Mon Sep 17 00:00:00 2001
From: Philipp Muens <raute1337@gmx.de>
Date: Mon, 15 May 2017 10:40:03 +0200
Subject: [PATCH 8/8] Add note about function versioning and deployments

---
 docs/providers/aws/cli-reference/rollback-function.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/providers/aws/cli-reference/rollback-function.md b/docs/providers/aws/cli-reference/rollback-function.md
index 8d498a9fb..fd77456e6 100644
--- a/docs/providers/aws/cli-reference/rollback-function.md
+++ b/docs/providers/aws/cli-reference/rollback-function.md
@@ -19,6 +19,8 @@ Rollback a function service to a specific version.
 serverless rollback function --name <name> --version <version>
 ```
 
+**Note:** You can only rollback a function which was previously deployed through `serverless deploy`. Functions are not versioned when running `serverless deploy function`.
+
 ## Options
 
 - `--name` or `-n` The name of the function which should be rolled-back